The expressiveness of tile GOMS language for describing how-to knowledge determines what kinds of human activities can be captured by a G0MS task analysis. This paper addresses the adequacy of this framwork for representing human behavior in realistically time-pressured, uncertain, and otherwise demanding task environments. Several improvements have been incorporated into a GOMS-Iike formalism called Procedure Description Language (PDL) and into a simple GOMS extension called GOMS+.

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